Delphi DLL

Fetch Oldest/Newest IMAP Email

Emails may be downloaded by sequence number. Assuming the selected mailbox is not empty, the oldest email is at sequence number 1, and the newest email is at sequence number N. The FetchSingle method may be used to download by sequence number. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Imap, Email;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
imap: HCkImap;
n: Integer;
isUid: Boolean;
oldestEmail: HCkEmail;
newestEmail: HCkEmail;

begin
success := False;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

imap := CkImap_Create();

// Connect to an IMAP server.
// Use TLS
CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);
success := CkImap_Connect(imap,'mail.testemail.net');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// Login
success := CkImap_Login(imap,'***','***');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// Select an IMAP mailbox
success := CkImap_SelectMailbox(imap,'Inbox');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// After selecting a mailbox, the NumMessages property
// contains the number of emails in the selected mailbox.

n := CkImap_getNumMessages(imap);

if (n > 0) then
  begin

    // The oldest email is always at sequence number 1.
    isUid := False;

    oldestEmail := CkEmail_Create();
    success := CkImap_FetchEmail(imap,False,1,isUid,oldestEmail);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        Exit;
      end;

    // Display the From and Subject
    Memo1.Lines.Add(CkEmail__fromAddress(oldestEmail));
    Memo1.Lines.Add(CkEmail__subject(oldestEmail));

    Memo1.Lines.Add('--');

    // The newest email is at sequence number N:
    newestEmail := CkEmail_Create();
    success := CkImap_FetchEmail(imap,False,n,isUid,newestEmail);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        Exit;
      end;

    // Display the From and Subject
    Memo1.Lines.Add(CkEmail__fromAddress(newestEmail));
    Memo1.Lines.Add(CkEmail__subject(newestEmail));

  end;

// Disconnect from the IMAP server.
success := CkImap_Disconnect(imap);

CkImap_Dispose(imap);
    CkEmail_Dispose(oldestEmail);
    CkEmail_Dispose(newestEmail);

end;